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Old 02-22-2008, 08:51 AM   #31
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Sub-panel grounding question.


250.32 (A) exception. With a 4 wire system the pannel at the garage doesn't need to be grounded. In a 4 wire isolated ground system if you put a ground on the pannel you will fail inspection. NEC 2005 page 70-99. I understood it to be a "detatched garage". I just pointed out that you go by code, and don't just throw a ground in when ever you want.

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Last edited by RobertS; 02-22-2008 at 02:28 PM. Reason: oops
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Old 02-22-2008, 09:25 AM   #32
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Sub-panel grounding question.


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230.32 (A) exception. With a 4 wire system the pannel at the garage doesn't need to be grounded. In a 4 wire isolated ground system if you put a ground on the pannel you will fail inspection. NEC 2005 page 70-99.
I believe you mean 250.32(A). And the exception applies only when a single branch circuit (or MWBC) is run to the separate building. If you run a subpanel in the detached building with either 3 wires or 4, a grounding electrode is required.

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